Cryptographic system, cryptographic method, and cryptographic program

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United States of America Patent

PATENT NO 9407438
APP PUB NO 20150010147A1
SERIAL NO

14376147

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Abstract

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The present invention aims to allow for addition of an attribute category without reissuing a public parameter. A cryptographic system 10 uses an indexing technique in dual system encryption in dual pairing vector spaces. Specifically, for a transmission-side vector tj for index j, the cryptographic system 10 sets information J assigned to the index j in advance as a coefficient of a predetermined basis vector. For a reception-side vector for index j′ corresponding to the index j, the cryptographic system 10 sets information J′ having an inner-product of 0 with the information J as a coefficient of a basis vector corresponding to the predetermined basis vector.

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Patent Owner(s)

Patent OwnerAddress
MITSUBISHI ELECTRIC CORPORATION7-3 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 1008310 JAPAN
NIPPON TELEGRAPH AND TELEPHONE CORPORATION5-1 OTEMACHI 1-CHOME CHIYODA-KU TOKYO 1008116

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Okamoto, Tatsuaki Musashino, JP 30 1679
Takashima, Katsuyuki Chiyoda-ku, JP 33 382

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